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TABLE 3
Number	Source of clay .	Percentage of water content in terms of dry   weight	Per cent volume shrinkage in terms of dry volume	Ratio pores  to volume of shrinkage water	Time  of slaking 1 clay 1 sand, minutes	Apparent specific gravity of dried clay	Modulus of rupture of 1 clay 1 sand, Ib. per sq. in.	Temp, of vitrification, degrees Centigrade	Over-firing temperature, degrees Centigrade	Softening temperature in cones
1	English ball clay ............	44.90	43 30	0 79	30	1 69	323	1 100	1 320	31H
2	Klingenberg, A. T. . .	39.68	42 58	0 57	78	1 79	381	1 125	1 450	32
3	Klingenberg, E. T .............	50. 66	55 05	0 56	108	1 70	363	1 100	1 450	32
4	Missouri .....................	43.63	43.63	0.72	33	1.72	351	1,175	1,450	32
5	Kentucky  ..........	45.28	34 53	1 05	9	1 55	234	1,260	1,450	32
6	Ohio	25 30	27 92	0 83	9	1 94	309	1,230	1,350	30H
7	Ohio      .......	22.08	24.46	0 80	g	2.01	281	1,290	1,400	31
g	Missouri	34 66	42 63	0 54	117	1 90	554	1,175	1,320	27
9	Illinois ....................	45.16	45 35	0 65	54	1 67	341	1,200	1,450	32
10	Kentucky	50 85	46 80	0 71	37	1 57	362	1,230	1,450	32
11	Tennessee .....................	44.73	35.27	0.97	27	1.56	282	1,175	1,450	32
12	Maryland ................... . .	38.91	40.61	0 67	114	1 76	518	1,175	1,390	31
13	Illinois	40.98	38 81	0 75	45	1 66	262	1,285	1,475	32
14	Mississippi ....................	31.39	31.36	0.81	55	1.81	326	1,290	1,450	30
15	English ball clay	40.33	39 85	0 75	41	1 71	389	1,100	1,425	32
										
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Similar results for fireclays of the No. 2 and lower types are reported in Table 4. (H. G. SCHURECHT, Jour. Am. Ceram. Soc., Vol. 1, 267-86.)
TABLE 4
No.	Source	Per cent water in terms of dry weight	Per cent shrinkage in terms of dry volume	Apparent specific gravity of dried clay	Modulus of rupture of clay dried at 110C.	Shrinkage at max. firing contraction	Temperature of vitrification in cones	Softening point in cones
i	Hoseville  Ohio	27.5	30.8	2.08	218.6	17.12	14 +	26 +
2	Mogadore  Ohio           .....	19.1	16.1	2.02	142.5	14.10	14 +	18
3	N  Brighton Pa.          .....	21.0	20.0	1.99	194.2	12.43	14	28
4	Crooksville, Ohio         .......	24.3	22.7	1.98	178. 8	13.70	14 +	28
5	Nelsonville, Ohio ...........	23.0	22.7	1.89	325.0	13. 30	14 +	31
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